WO2010054453A1 - Procédé et installation de traitement d'enrobés à chaud d'asphalte - Google Patents

Procédé et installation de traitement d'enrobés à chaud d'asphalte Download PDF

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Publication number
WO2010054453A1
WO2010054453A1 PCT/BR2009/000367 BR2009000367W WO2010054453A1 WO 2010054453 A1 WO2010054453 A1 WO 2010054453A1 BR 2009000367 W BR2009000367 W BR 2009000367W WO 2010054453 A1 WO2010054453 A1 WO 2010054453A1
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WO
WIPO (PCT)
Prior art keywords
hot
size
plant
asphalt
mix asphalt
Prior art date
Application number
PCT/BR2009/000367
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English (en)
Other versions
WO2010054453A8 (fr
Inventor
Claudio Macedo Nasser
Patricia Vasconcelos Correa Nasser
Original Assignee
Claudio Macedo Nasser
Nasser Patricia Vasconcelos Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Claudio Macedo Nasser, Nasser Patricia Vasconcelos Co filed Critical Claudio Macedo Nasser
Publication of WO2010054453A1 publication Critical patent/WO2010054453A1/fr
Publication of WO2010054453A8 publication Critical patent/WO2010054453A8/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/104—Mixing by means of movable members in a non-rotating mixing enclosure, e.g. stirrers

Definitions

  • the present invention relates in general to an improvement over the prior art hot-mix asphalt plants that use a drier with a fossil fuel burner, that is, direct application of flame for heating and drying cold ingredients (gravel, sand and stone powder) in order to produce hot-mix asphalt.
  • the invention further relates to an improvement over the prior art hot-mix asphalt plants that take a short time to heat, dry and mix the cold ingredients with liquid asphalt cement for producing the hot-mix asphalt.
  • Hot-mix asphalt products are produced by means of two types of hot-mix asphalt plants: gravity-driven (gravimetric) plants and volumetric plants (known as drum-mixer type plants).
  • the gravimetric plants are those wherein the hot-mix asphalt is produced by heating the cold ingredients with direct incidence of a flame in the heater, whereupon the said cold ingredients upon being heated are conveyed to the hot elevator and to the hot metering silos/tanks, wherein they are weighed to be subsequently conveyed to the pugmill mixer, wherein there is then added cold filler and hot asphalt, the whole mass being subjected to mixing during a period of up to forty-five seconds, at most, there being thus provided a ready batch of hot-mix asphalt.
  • the volumetric type plants are those wherein the hot-mix asphalt is produced by heating the cold ingredients (gravel, powdered stone, sand) with the use of an exhaust system and a directly applied flame thereon at the drier, whereupon they are metered and weighed using a set of scales integrated with the asphalt pump, within a zone located outside of the reach of the flame in an outer sleeve next to the drier or in the pugmill, the whole mass being then mixed with asphalt for a period of up to thirty seconds, at most, with continuous output of the ready hot-mix asphalt.
  • the cold ingredients gravel, powdered stone, sand
  • the conventional plants use a series of equipment items that could be substituted with a sole item, to wit, a drier, exhaust fan, exhaust ducting, pugmill, pre-separator cyclone means, silo/tank for storing the hot-mix asphalt without harming the quality and the quantity of the hot-mix asphalt having been produced.
  • the conventional plants produce a hot-mix asphalt product that does not withstand for a long time the heavy traffic on paved roadways and airport runways.
  • the conventional plants damage the cold ingredients every time they are calibrated to produce hot-mix asphalt. Each time that a conventional plant is shut down, there will be lost the heated and dried cold ingredients that remain trapped within the silo/tank or the pugmill for hot-mix asphalt, which in addition contribute to soiling the plant.
  • the conventional plants damage the cold ingredients and reverse the direction of transport of the cold feed every time they are calibrated for producing hot-mix asphalt.
  • the conventional plants are forced to remove and further lose the heated and dried cold ingredients that remain trapped within the plants every time that the plants are shut down. This fact, in addition to entailing a loss of material, fills the plant with dust and dirt.
  • the filler charge one of the components of the hot-mix asphalt, is not heated, but rather added while cold, at ambient temperature, together with the cold ingredients that were heated and dried in the pugmill.
  • the conventional plants take only a short time for heating, drying and mixing. They do not allow sufficient time for mixing the liquid asphalt cement with the cold ingredients upon the latter being heated to allow for the provision of a hot-mix asphalt of better quality.
  • Such plants involve a difficult control of dust and soot arising from the stream of hot gasses originating from the combustion in a burner, since the air purifier filter of these plants operates in dry mode, with a cyclone means, a pre-collector and extractor coils that integrate into the production process (with extremely poor physical and quantitative control) a certain amount of dust particles, also by means of a screw-type auger conveyor and a fines recovery valve.
  • the cold ingredients are heated and dried in small amounts for production of the hot-mix asphalt (The plants are unable to produce, at one sole time, the entire load capacity of a dumper truck. They produce, at most, a pull- cart-sized amount (about 3 tons or 1.5 cubic meters) of hot-mix asphalt in each cycle of operation). These are small batches, and such small-sized batches are prone to entailing variance of the asphalt content, causing premature disaggregation due to lack of enough binder, or causing an undesirably smooth surface, subject to deformation, due to the presence of an excessive amount of binder.
  • the conventional plants use combustion processes, with fire in the form of direct incidence of a flame of a fossil fuel burner for heating and drying the cold ingredients in order to produce the hot-mix asphalt.
  • the stream of hot gasses produced by the combustion that takes place at the burner is discharged into the atmosphere at a high flow rate, in the order of 100,000 m 3 /h (one hundred thousand cubic meters per hour). They do not allow to reduce, in the process of production, the emissions of CO 2 (carbon dioxide or carbon gas) per ton of hot-mix asphalt produced.
  • the hot-mix asphalt plant and method according to the present invention were designed to produce hot-mix asphalt without using exhaust means or direct flame incidence on the cold ingredients, thereby providing an improved and stronger hot-mix asphalt, intended to extend the useful life of asphalt pavements, with due regard to the extremely important requisite of protection to the environment, with lower emission of pollutants, noise and heat.
  • the method according to the present invention does not use direct flame for heating and drying the cold ingredients, thereby allowing the soot (the powder generated by the heating of the cold ingredients) to avoid being subjected to dynamic separation from the cold ingredients while the same are being heated, such that the particles larger than 2.00 mm, micro-particles larger than 0.75 mm and smaller than 2.00 mm and very small fractions of the soot of sizes smaller than 0.75 mm, remain incorporated to the production of hot-mix asphalt, since the force of gravity is acting on these particles, without interference from the mechanical action of forced exhaust (the soot is not sucked into an exhaust system), and furthermore, such that the variable velocity of the axles be adequate for performance of the various functions, to wit: in the range of 3.3 rpm for drying; in the range of 6.6 rpm for mixing; in the range of 9.9 rpm for discharging, allowing a longer time span for heating, drying and mixing the cold ingredients with asphalt, providing enhanced action on the hot-mix asphalt until the same is rendered fully uniform
  • the hot-mix asphalt plant that constitutes the object of the present invention allows the petroleum refining plants to increase their sales of asphalts and emulsions, since the various economic, environmental and other characteristics thereof will certainly render feasible a number of roadway- projects presently awaiting proper budget allowances to become a reality; the production of hot-mix asphalt plants that do not use direct flame on the cold ingredients, will allow a greater flexibility and strength by means of the mixture of cold ingredients that cannot withstand the application of direct flame thereto (for example, discarded and ground tires for increasing the friction conditions of the asphalt paving); allows the concessionary companies that manage the roadways the benefits of lesser cost and better quality, without variations of the asphalt in the hot-mix asphalt product and with enhanced flexibility and better resistance to wear, by lengthening the intervals between maintenance actions performed in connection therewith, entailing a positive trend towards a reduction of the number of complaints relative to work performed on the asphalt-paved roadways .
  • the hot-mix asphalt plant that constitutes the object of the present invention allows the production of hot-mix asphalt products with mineral grain sizes passing through the square mesh screens of 3" x 3" (7.62 cm x 7.62 cm) for replacement of broken slabs of plain concrete or armored concrete in the system of runways and taxiing and parking aprons in airports, and in roadways in sections located on the slopes of mountains.
  • the hot-mix asphalt plant that constitutes the object of the present invention is useful for companies that make repairs in flexible hot-mix asphalt paved surfaces, such as public service concessionary companies that operate potable water, sewage, gas, electric power, landline telephone systems, etc.
  • the present invention teaches a method for the preparation of hot-mix asphalt, aimed at producing better and stronger hot-mix asphalt products, characterized by using a hot-mix asphalt plant without exhaust means or direct flame incidence on the cold ingredients, allowing a longer time for heating, drying and mixing the filler charge and the cold ingredients, upon the latter being heated, with the asphalt, wherein the cold ingredients are fed through a feeding inlet, with the ingredients being gradually mixed in the hot- mix asphalt plant, using a drier and mixer assembly, provided parallel to the horizontal, using removable rotary axles provided with vanes and a speed variation means for each function of drying, mixing and discharging, operating at a temperature of 150 deg. C to 160 deg. C, there being thereafter added the asphalt at a temperature of 160 deg.
  • the invention also teaches a plant for the production of hot-mix asphalt, intended to produce better and stronger hot-mix asphalt products, such plant having: an inlet through which are added the sorted, metered and weighed cold ingredients, ready for the production process; and a discharge outlet through which the hot-mix asphalt is withdrawn, upon the same being fully uniform and ready, characterized by being provided, in the interior thereof, with a circular drier and mixer assembly provided parallel to the horizontal, such circular drier and mixer assembly being provided with removable rotary axles and a speed variation means, and with vanes for mixing the heated and dried cold ingredients and the filler charge with the liquid asphalt cement; and provided, at the underside and lateral sides thereof, externally to the parallel circular heater and mixer assembly, with heating devices to provide a heat exchange that initially takes place by conduction, followed by irradiation and convection for full heat transfer as required for the production of the hot-mix asphalt.
  • the heating devices are selected from among electrical resistors, gas-fueled heaters, or any other thermal energy source, provided that such thermal source does not use any exhaust means.
  • the same is equipped with a purifier filter coupled to the drier and mixer assembly.
  • the method and the plant according to the invention produce hot- mix asphalt products with size #2 and/or size #3 stone in the particle size of the cold ingredients.
  • size #2 stone means a particle with a size able to pass through the square passages of a square mesh screen having a size or diameter of up to 38.10 mm (1.5”) and that is retained and will not pass through the square passages of a mesh screen having a size or diameter of 19.10 mm (3/4")
  • size #3 stone means a particle with a size able to pass through the square passages of a square mesh screen having a size or diameter of up to 76.20 mm (3") and that is retained and will not pass through the square passages of a mesh screen having a size or diameter of 38,10 mm (1.5").
  • Such method and plant according to the invention further allow the mixing of the filler charge together with the cold ingredients to be heated and dried in order to produce hot-mix asphalt.
  • the plant according to the present invention does not use direct flame on the cold ingredients; the plant according to the present invention is equipped with a speed variation means, while such means is not found in any other asphalt plant, intended to control and provide a correct speed for each function in the process; in the plant according to the present invention there is no mechanical exhaust, as opposed to the exhaust of up to 100,000 m 3 /h of the plants known to date; the plant according to the present invention does not have a flame with up to six meters of length in the burner; the plant according to the present invention does neither perform heating nor drying at temperatures of 850 deg.
  • the plant according to the present invention stores within itself the hot-mix asphalt having been produced, using dynamic thermal heating, instead of a static thermal silo/tank; with the plant according to the present invention all the soot is retained in the hot-mix asphalt; with the plant according to the present invention there is no mechanical return of the soot; with the plant according to the present invention there is no segregation of the hot-mix asphalt, due to an enhanced mechanical action on the hot-mix asphalt, whereby is generated a hot-mix asphalt of superior quality with the added benefit of using a lesser amount of asphalt.
  • the plant according to the present invention is easier to transport with diameters of up to four meters, the plant has its own chassis with wheels, and larger plants can be easily assembled on-site.
  • the plant according to the present invention has a purifier filter coupled to the plant's drier and mixer assembly, allowing ample control of environmental pollution.
  • the plant according to the present invention provides an enhanced mechanical action on the hot-mix asphalt, during the process of production thereof, which is fundamental in terms of quality and uniformity of the hot-mix asphalt, and further allows the production of hot-mix asphalt products using ingredients that have been subjected to exposure to the weather, having thereby become wet, without hindering the asphalt recapping operations and the control of temperature.
  • the plant according to the present invention is much more economical than the prior art plants, since it does not require a vertical cyclone device, a horizontal cyclone device, a bucket elevator for heated cold ingredients and air intake blowers. Moreover, it is much easier to operate due to the fact that since there is no direct flame applied to the cold ingredients, there is no mechanical exhaust of up to 100,000 m 3 /h as occurs with the prior art plants, whereby the environmental control is substantially simplified, as the soot is not sucked in, and simply stays in the hot-mix asphalt plant due to the action of gravity, there occurring but a minimal natural exhaust of hot gasses, such exhaust being spaced along the time of production of the hot- mix asphalt.
  • Figure 1 represents a vertical cross-sectional view diametrally in the form of a ground plan of the hot-mix asphalt plant according to the present invention
  • Figure 2 is a horizontal cross sectional view of the hot-mix asphalt plant depicted in Figure 1,
  • Figure 3 is a vertical cross-sectional view in the form of a ground plan of the hot-mix asphalt plant that constitutes the object of the present invention, together with the cold storage silos/tanks for the ingredients as well as the drag elevator for conveying the hot-mix asphalt upon the same being ready, and
  • Figure 4 is a top view of the hot-mix asphalt plant that constitutes the object of the present invention together with the cold storage silos/tanks for the ingredients, as well as the drag elevator for conveying the hot-mix asphalt upon the same being ready, as shown in Figure 3.
  • the hot-mix asphalt plant 1 that constitutes the object of the present invention is provided with a circular drier and mixer assembly provided parallel to the horizontal direction, allowing the production of up to five hundred tons of hot-mix asphalt products per batch with a time of production of twenty-five to thirty minutes per batch, the plant being equipped with a purifier filter coupled to the drier and mixer assembly.
  • the plant has an inlet 2 through which are added the sorted, metered and weighed cold ingredients, ready for the process of production of hot-mix asphalt.
  • removable rotary axles 3 with a speed variation means and equipped with vanes for mixing the heated and dried cold ingredients with the hot asphalt which acts as a binder for the heated cold ingredients in the process of production of hot-mix asphalt.
  • the plant 1 is further provided with an outlet 4 through which is withdrawn the hot-mix asphalt upon the same being fully uniform and ready.
  • the plant 1 is further preferably provided, at its underside and lateral parts, externally to the parallel circular heater and mixer assembly, with heating means 5 for providing a heat transfer by conduction, followed by irradiation and convection, thereby avoiding the incidence of any direct flame on the cold ingredients.
  • heating means 5 may be positioned at other appropriate locations in the plant 1, in order to provide heating and drying without any direct flame incidence on the cold ingredients intended to be heated.
  • the said heating means 5 may be located immediately below the parallel circular drier and mixer assembly.
  • Such heating means 5 may be selected from among electrical resistors, gas-fueled heaters, or any other source of thermal energy.
  • the geometric shape of the hot-mix asphalt plant that constitutes the object of the present invention is different from that of any hot-mix asphalt plant known in the prior art, providing at least five times less environmental impact (i.e., in terms of tons of CO 2 emissions) and thermal heating, for a cost of manufactured ton of product that is 30% lower than the present average cost to be met.
  • the removable rotary axles 3 with speed variation means and with vanes for mixing the heated and dried cold ingredients with the asphalt may be used at various speeds of operation, preferably at speeds of 3.3 rpm for drying; of 6.6 rpm for mixing; and of 9.9 rpm for discharging the product, allowing more time for heating, drying and mixing the heated cold ingredients with pure asphalt or asphalt enriched with polymers, until there is achieved full uniformity, thereby providing an enhanced mechanical action on the hot-mix asphalt, improving the quality of the latter and providing a greater strength thereof.
  • the hot-mix asphalt plant 1 that constitutes the object of the present invention is the only plant known from this time onwards that keeps on mixing the contents thereof while simultaneously providing the storage therein of the hot-mix asphalt produced with dynamic thermal heating, instead of using a static thermal silo/tank.
  • the hot-mix asphalt plant 1 that constitutes the object of the present invention produces hot-mix asphalt products with mineral material grain size of up to 75 mm, for replacement of slabs of plain concrete or armored concrete in airports and roadways.
  • the hot-mix asphalt plant 1 that constitutes the object of the present invention is fully computerized, is capable of producing up to five hundred tons of hot-mix asphalt per batch for a batch production time of twenty-five minutes for dry ingredients and thirty minutes using wet ingredients, eliminating any type of contact of the heated cold ingredients with the environment, having sensors installed in each of its components for detecting possible problems and thereby immediately interrupting the production process.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Road Paving Machines (AREA)

Abstract

L’invention concerne un procédé et une installation (1) de traitement d’enrobés à chaud d’asphalte permettant de produire de tels enrobés de qualité et de résistance améliorées sans les soumettre directement à la flamme, tout en permettant d’allonger les temps de séchage, de chauffage et de mélangeage des ingrédients froids chauffés avec l’asphalte, d’où une réduction des coûts et une amélioration significative des caractéristiques des enrobés. Du fait de l’introduction des ingrédients froids par un orifice d’alimentation (2), lesdits ingrédients ainsi que la charge sont progressivement mélangés dans l’installation par un ensemble de séchage et mélangeage parallèle à la direction horizontale et entrainé par des axes tournants amovibles (3) munis de pales et de variateurs de vitesse agissant sur chacune des fonctions de séchage, mélangeage et décharge.
PCT/BR2009/000367 2008-11-13 2009-11-06 Procédé et installation de traitement d'enrobés à chaud d'asphalte WO2010054453A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI0805002-3 2008-11-13
BRPI0805002 BRPI0805002A2 (pt) 2008-11-13 2008-11-13 processo e usina para usinar asfalto a quente, para produzir misturas asfálticas quentes melhores e mais resistentes

Publications (2)

Publication Number Publication Date
WO2010054453A1 true WO2010054453A1 (fr) 2010-05-20
WO2010054453A8 WO2010054453A8 (fr) 2010-07-15

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PCT/BR2009/000367 WO2010054453A1 (fr) 2008-11-13 2009-11-06 Procédé et installation de traitement d'enrobés à chaud d'asphalte

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BR (1) BRPI0805002A2 (fr)
WO (1) WO2010054453A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112341046A (zh) * 2020-10-29 2021-02-09 四川中广建材有限公司 一种新型沥青冷补料及其制备方法
CN114367232A (zh) * 2021-12-13 2022-04-19 陕西交通职业技术学院 一种基于干湿法相结合的复合改性沥青混合装置
CN114920498A (zh) * 2022-06-28 2022-08-19 重庆诚邦路面材料有限公司 生物基常温沥青混合料及制备方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR202015013385Y1 (pt) * 2015-06-09 2020-06-16 Ciber Equipamentos Rodoviários Ltda Aperfeiçoamento aplicado em usinas asfálticas móveis dotadas de proteções laterais
CN106868985A (zh) * 2017-02-27 2017-06-20 成都佰思汇信科技有限责任公司 一种连续式热拌沥青混合料搅拌设备
CN115160807B (zh) * 2022-07-26 2023-03-21 长沙理工大学 一种生物改性沥青及其制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394094A (en) * 1964-04-20 1968-07-23 Ind Asphalt Of California Inc Process of preparing a paving composition

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394094A (en) * 1964-04-20 1968-07-23 Ind Asphalt Of California Inc Process of preparing a paving composition

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112341046A (zh) * 2020-10-29 2021-02-09 四川中广建材有限公司 一种新型沥青冷补料及其制备方法
CN114367232A (zh) * 2021-12-13 2022-04-19 陕西交通职业技术学院 一种基于干湿法相结合的复合改性沥青混合装置
CN114367232B (zh) * 2021-12-13 2022-09-06 陕西交通职业技术学院 一种基于干湿法相结合的复合改性沥青混合装置
CN114920498A (zh) * 2022-06-28 2022-08-19 重庆诚邦路面材料有限公司 生物基常温沥青混合料及制备方法

Also Published As

Publication number Publication date
WO2010054453A8 (fr) 2010-07-15
BRPI0805002A2 (pt) 2009-09-22

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